split out shoebox into smaller files
This commit is contained in:
Sandy Walsh
parent
72a603e58b
commit
2dee06e43d
17
README.md
17
README.md
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@ -3,11 +3,16 @@ shoebox
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binary data archiving library - supports uploading to object storage
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Requires PyTables, which needs (on ubuntu):
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There are ArchiveReaders and ArchiveWriters which are managed
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by RollManager. The RollManager opens and closes Archivers as
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needed. "As needed" is determined by which RollChecker that was
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passed into the RollManager. Archive files can roll over based
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on file size or elapsed time (for writing). For reading, archive
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files are only rolled over when the EOF is reached.
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sudo apt-get install libhdf5-serial-dev
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sudo pip install numpy
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sudo pip install numexpr
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sudo pip install cython
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sudo pip install tables
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Roll Managers also take care of filename creation, compression
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of completed archives and transfer of archive files to remote
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storage locations.
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TODO: How will the ReadingRollManager know which files to read
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from, and in which order, if the filename is templated?
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@ -0,0 +1,50 @@
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# Copyright (c) 2014 Dark Secret Software Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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class Archive(object):
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def __init__(self, filename):
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self._handle = None
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self.filename = filename
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def get_file_handle(self):
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return self._handle
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class ArchiveWriter(Archive):
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"""The active Archive for appending.
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"""
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def __init__(self, filename):
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super(ArchiveWriter, self).__init__(filename)
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self._handle = open(filename, "wb+")
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def write(self, payload):
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pass
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class ArchiveReader(Archive):
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"""The active Archive for consuming.
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"""
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def __init__(self, filename):
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super(ArchiveReader, self).__init__(filename)
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def read_block(self):
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pass
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def read_header(self):
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pass
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def read_payload(self):
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pass
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@ -0,0 +1,52 @@
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# Copyright (c) 2014 Dark Secret Software Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import utils
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class RollChecker(object):
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def start(self, archive):
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"""Called when a new archive is selected."""
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pass
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def check(self, archive):
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"""Should the current archive roll?"""
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pass
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class NeverRollChecker(RollChecker):
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def check(self, archive):
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return False
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class TimeRollChecker(RollChecker):
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def __init__(self, timedelta):
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self.timedelta = timedelta
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def start(self, archive):
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self.start_time = utils.now()
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self.end_time = self.start_time + self.timedelta
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def check(self, archive):
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return utils.now() >= self.end_time
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class SizeRollChecker(RollChecker):
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def __init__(self, size_in_gb):
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self.size_in_gb = size_in_gb
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def check(self, archive):
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size = archive._get_file_handle().tell()
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return size / 1073741824 >= self.size_in_gb
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@ -0,0 +1,72 @@
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# Copyright (c) 2014 Dark Secret Software Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import archive
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import utils
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class RollManager(object):
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def __init__(self, filename_template, roll_checker, directory="."):
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self.filename_template = filename_template
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self.roll_checker = roll_checker
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self.directory = directory
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self.active_archive = None
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def _make_filename(self):
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f = utils.now().strftime(self.filename_template)
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return f.replace(" ", "_")
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def get_active_archive(self):
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if not self.active_archive:
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filename = self._make_filename()
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self.active_archive = self.archive_class(filename)
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self.roll_checker.start(self.active_archive)
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return self.active_archive
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def _should_roll_archive(self):
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return self.roll_checker.check(self.active_archive)
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def _roll_archive(self):
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pass
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class ReadingRollManager(RollManager):
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def __init__(self, filename_template, roll_checker, directory="."):
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super(ReadingRollManager, self).__init__(filename_template,
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roll_checker, directory)
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self.archive_class = archive.ArchiveReader
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def read_block(self):
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pass
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def read_header(self):
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pass
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def read_payload(self):
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pass
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class WritingRollManager(RollManager):
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def __init__(self, filename_template, roll_checker, directory="."):
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super(WritingRollManager, self).__init__(filename_template,
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roll_checker, directory)
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self.archive_class = archive.ArchiveWriter
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def write(self, payload):
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a = self.get_active_archive()
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a.write(payload)
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if self._should_roll_archive():
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self._roll_archive()
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@ -1,192 +0,0 @@
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# Copyright (c) 2014 Dark Secret Software Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import datetime
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import struct
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"""Binary data archiving library.
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Data is written in the following format:
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[ENTRY] =
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<START-OF-BLOCK> byte # 0x05
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<BLOCK-TYPE> long # new versions get new block-types
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<CRC> ulong
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<SIZE> long
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[PAYLOAD] =
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<START-OF-PAYLOAD> byte # 0x06
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<RECORD_COUNT> int
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[RECORD, RECORD, ...]
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[RECORD] =
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<SIZE> long
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<KEY> varstr (%s)
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<TYPE> int
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<UNION>
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<BOOLEAN>
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<INT>
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<FLOAT>
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<DATETIME>
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<STRING>
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There are ArchiveReaders and ArchiveWriters which are managed
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by RollManager. The RollManager opens and closes Archivers as
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needed. "As needed" is determined by which RollChecker that was
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passed into the RollManager. Archive files can roll over based
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on file size or elapsed time (for writing). For reading, archive
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files are only rolled over when the EOF is reached.
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Roll Managers also take care of filename creation, compression
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of completed archives and transfer of archive files to remote
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storage locations.
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TODO: How will the ReadingRollManager know which files to read
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from, and in which order, if the filename is templated?
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"""
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def now():
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"""Broken out for testing."""
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return datetime.datetime.utcnow()
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class RollChecker(object):
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def start(self, archive):
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"""Called when a new archive is selected."""
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pass
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def check(self, archive):
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"""Should the current archive roll?"""
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pass
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class NeverRollChecker(RollChecker):
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def check(self, archive):
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return False
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class TimeRollChecker(RollChecker):
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def __init__(self, timedelta):
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self.timedelta = timedelta
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def start(self, archive):
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self.start_time = now()
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self.end_time = self.start_time + self.timedelta
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def check(self, archive):
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return now() >= self.end_time
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class SizeRollChecker(RollChecker):
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def __init__(self, size_in_gb):
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self.size_in_gb = size_in_gb
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def check(self, archive):
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size = archive._get_file_handle().tell()
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return size / 1073741824 >= self.size_in_gb
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class RollManager(object):
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def __init__(self, filename_template, roll_checker, directory="."):
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self.filename_template = filename_template
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self.roll_checker = roll_checker
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self.directory = directory
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self.active_archive = None
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def _make_filename(self):
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f = now().strftime(self.filename_template)
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return f.replace(" ", "_")
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def get_active_archive(self):
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if not self.active_archive:
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filename = self._make_filename()
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self.active_archive = self.archive_class(filename)
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self.roll_checker.start(self.active_archive)
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return self.active_archive
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def _should_roll_archive(self):
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return self.roll_checker.check(self.active_archive)
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def _roll_archive(self):
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pass
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class ReadingRollManager(RollManager):
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def __init__(self, filename_template, roll_checker, directory="."):
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super(ReadingRollManager, self).__init__(filename_template,
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roll_checker, directory)
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self.archive_class = ArchiveReader
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def read_block(self):
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pass
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def read_header(self):
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pass
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def read_payload(self):
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pass
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class WritingRollManager(RollManager):
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def __init__(self, filename_template, roll_checker, directory="."):
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super(WritingRollManager, self).__init__(filename_template,
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roll_checker, directory)
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self.archive_class = ArchiveWriter
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def write(self, payload):
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a = self.get_active_archive()
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a.write(payload)
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if self._should_roll_archive():
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self._roll_archive()
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class Archive(object):
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def __init__(self, filename):
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self._handle = None
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self.filename = filename
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def get_file_handle(self):
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return self._handle
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class ArchiveWriter(Archive):
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"""The active Archive for appending.
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"""
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def __init__(self, filename):
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super(ArchiveWriter, self).__init__(filename)
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self._handle = open(filename, "wb+")
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def write(self, payload):
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pass
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class ArchiveReader(Archive):
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"""The active Archive for consuming.
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"""
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def __init__(self, filename):
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super(ArchiveReader, self).__init__(filename)
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def read_block(self):
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pass
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def read_header(self):
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pass
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def read_payload(self):
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pass
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@ -0,0 +1,21 @@
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# Copyright (c) 2014 Dark Secret Software Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import datetime
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def now():
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"""Broken out for testing."""
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return datetime.datetime.utcnow()
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@ -1,95 +0,0 @@
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import datetime
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import mock
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import unittest
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from shoebox import shoebox
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class TestRollChecker(unittest.TestCase):
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def test_time_roll_checker_start(self):
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one_hour = datetime.timedelta(hours=1)
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x = shoebox.TimeRollChecker(one_hour)
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now = datetime.datetime.utcnow()
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with mock.patch.object(shoebox, 'now') as dt:
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dt.return_value = now
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x.start(None)
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self.assertEqual(x.start_time, now)
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self.assertEqual(x.end_time, now + one_hour)
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def test_time_roll_checker_end(self):
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one_hour = datetime.timedelta(hours=1)
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x = shoebox.TimeRollChecker(one_hour)
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now = datetime.datetime.utcnow()
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x.start_time = now
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x.end_time = now + one_hour
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with mock.patch.object(shoebox, 'now') as dt:
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dt.return_value = now + one_hour
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self.assertTrue(x.check(None))
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with mock.patch.object(shoebox, 'now') as dt:
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dt.return_value = now
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self.assertFalse(x.check(None))
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with mock.patch.object(shoebox, 'now') as dt:
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dt.return_value = now + one_hour - datetime.timedelta(seconds = 1)
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self.assertFalse(x.check(None))
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def test_size_roll_checker_end(self):
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one_gig = 1073741824
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x = shoebox.SizeRollChecker(10)
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archive = mock.Mock()
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archive._get_file_handle.return_value.tell.return_value = one_gig * 5
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self.assertFalse(x.check(archive))
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archive._get_file_handle.return_value.tell.return_value = one_gig * 10
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self.assertTrue(x.check(archive))
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archive._get_file_handle.return_value.tell.return_value = one_gig * 11
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self.assertTrue(x.check(archive))
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class TestRollManager(unittest.TestCase):
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def test_make_filename(self):
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filename_template = "filename_%c"
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now = datetime.datetime(day=1, month=2, year=2014,
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hour=10, minute=11, second=12)
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x = shoebox.RollManager("filename_%c.dat", None)
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with mock.patch.object(shoebox, "now") as dt:
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dt.return_value = now
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filename = x._make_filename()
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self.assertEqual(filename, "filename_Sat_Feb__1_10:11:12_2014.dat")
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class TestWritingRollManager(unittest.TestCase):
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def test_get_active_archive(self):
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roll_checker = mock.Mock()
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filename_template = "filename_%c.dat"
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x = shoebox.WritingRollManager(filename_template, roll_checker)
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archive = x.get_active_archive()
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self.assertTrue(isinstance(archive, shoebox.ArchiveWriter))
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self.assertTrue(roll_checker.start.called)
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def test_write_always_roll(self):
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roll_checker = mock.Mock()
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roll_checker.check.return_value = True
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x = shoebox.WritingRollManager("template", roll_checker)
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with mock.patch.object(x, "_roll_archive") as ra:
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x.write("payload")
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self.assertTrue(ra.called)
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def test_write_never_roll(self):
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roll_checker = mock.Mock()
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roll_checker.check.return_value = False
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x = shoebox.WritingRollManager("template", roll_checker)
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with mock.patch.object(x, "_roll_archive") as ra:
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x.write("payload")
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self.assertFalse(ra.called)
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class TestWriting(unittest.TestCase):
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def test_write(self):
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roll_checker = shoebox.NeverRollChecker()
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x = shoebox.WritingRollManager("template_%s", roll_checker)
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for index in range(10):
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x.write("payload_%d" % index)
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